Locking-switch.



J. MIBAUM.

LOOKING SWITCH,

APPLICATION FILED JULY 11A 1G18, l, l 20,21 0. Patented De@ s. 1914,

2 SHETS SIM ITT W JEROIfIE MAIBAUM, OF NEW YORI, N. Y., ASSIGNOB, TOTHOMAS E. MURRAY, 0l?

- NEW YORK., N. Y.

i LocKING-swrren.

Specification of Letters Patent.

Patenten nee. s, '1914.

Application led Jnlyll, 19.*13. Serial No. 778,430.

`of high voltage are to be transmitted-os,

for example, from the bus-bar of n generating station to theV serviceleads. lrVhere a piiotcd blade. switch is thus used, it bccomessubjected to enormous stresses due to the `tendency of :t movableconductor so to move as to include. the `greatestnumber of lines ofAforce. The result is that the blade tends to leave its cooperatingcontact and'so open the circuit, while the two supports whichrespectivel)l carry .the blade and contact tend to spread apart andbreak. There are thus two components of force. to` be met, namely, one.in the. direction of thearrow a in Fig. l oY the accompanying drawings,

L and the other at right angles thereto inthe direction of the arrow`l), -both components being in the same plane', which is also the planeof movement of the blade.

My invention is a. locking device for the blade, so constructed andarranged as to operate in e direction perpendicular to the aforesaidplane. of movement, and thus to prevent both the separation of the bladefrom its contact and the spreading apart of the blade and contactsupports. Furthermore, the magnetic lines oiforce at the lock areparallel to the direction of motion of the bolt, and hence any current,eddy or otherwise, that it might carry cannot produce e force tending towithdraw seid bolt from locked position` l My invention further'consists in the construction of the insulating supportspfor the bladeand cooperating contact, and of the lever blade Vand operating devicefor the bolt, whereby said blade may be moved into and out ofcircuit-closing position, without necessitating dangerous proiiimit)7 oftheA operator to the switch.

n the accompanying drawings-Figure 1 is a vertical longitudinal sectionof my locking switch. Fig. 2 is evertical section on the line m, :v ofFig. i,showing the locking bolt engaged. Eig. 3 is a similar section,showing the mode of releasing the lock. Fig. 4 is a top view of thelocking end of the switch` Fig. 5 'is a vertical section of e modifiedform of the locking device on the line y, 1,1 of Fig. G, showing thebolt engaged. Fig. G is a similar-section, showing the mode of releasingtheklock. F ig, 'i' is a. side elevation and Fig. 8 is a`to viewof thelock# ing device of Figs. 4 an( 5.

Similar numbers' and letters of reference indica te like parts.

The switch blade A is preferably supe.' ported upon two metal rods l, 2,which are received in bushings 3, which are inclosed l in sleeves 4 ofinsulating material.` Each lsleeve is made in two shouldered parts 5,

6. one ha ving an annular projection entering an annular recess of theother and receivingr between their shoulders the supportin 5 base,preferably also of insulating materia The lower ends of therods 1, 2 maybe which the sleeves are tightly clamped 'upon said base. To the rod?Imay be connected n clamping frame 9, which carriesthe laminated bus-bar1()r Upon the rod -l is csr! ried the bracket 11, to which'is'pivotedthe switch blade A. A main circuit conductor 13 is secured 'to nprojection 14 on said bracket.

`The upper end o'f'ro'd 2 is threaded to rethreaded to receive nuts 8,by setting up ecirc. the metal block B, preferably of c0p- 'K Said blockis vertically recessed to rethe' beveled locking boitY E, having an uQ95 ward projection F which` travels in a sift;

G, when said bolt `is longitudinally move Secured to said block is acup-shaped casing H, preferably of manganese bronze, having a centralopening in its outer Wall, through which passes a. guide-rod I fast onbolt E. There is a collar J 0n said rod, and between said collar andsaid casing Wall is a helical spring K which normallyv tends to movesaid bolt into locking position, :is shown in Fig. 2, the bolt thenentering1 an opening L in blade A which registers with the bolt in blockB. Above the opening L inlcver A is another opening M, .for a purpose tobe explained.

' in block B it meets the beveled end of bolt E, and so forces said boltrearwardly, com-` pressing spring K until the opening L comes oppositethe bolt end. The bolt is then free to be thrown forward by thecompressed spring thus entering opening L and locking blade A in closedposition.

In order to manipulate the blade A, I provide any suitable handle or rod`of wood 0r other insulating material, having at its end a ferrn'lehaving two metal projections N, O. In closing the blade, the shortprojection N is inserted in opening M, and the blade is then operated.To raise the blade, the longer projection Ois inserted in said openinguntil the edge ofthe blade enters a groove P on the upper side of saidprojection, as shown in Fig. 3. The end of projection O then meets'theprojection F and pushes the same rearwardly until the end of the boltclears the opening L in blade A, after which said blade may be raised bythe rod or handle. An operating rod, such as described, is necessary,because the very high voltage which the switch controls renders itimpossible for the operator to use his hands,

or even nearly to approach the switch. In practice, I malte said rodsome seven or eight feet in length.

Referring to the modified form of my deyjce shown in Figs. 5 to 8,inclusive: The bolt E is slotted to receive one end or' a bell cranklever Q which is pivoted in lugs R on the block B` The easing H issuitably lengthened to accommodate the longer bolt, and has a slot Sinits wall to permit the play of bell crank lever QJ'- The shortprojection N enters the opening M in blade A and is used, as before,'in,moving said blade to closed and locked position, as shown 'in Fig. ll,dotted lines. Vhen it is desired to raise blade A, the projection C) isinserted into opening M, so that,I as shown in Fig. 6,

Yand cooperating with a circuit terminal on the other support, a boltslidable in said last-named support in a direction perpendicular to theplane of movement of said blade and entering an opening in said blade, aspring for holding said bolt in engage- -ment with said blade, and alateral projection on said bolt :Ithe said blade lhaving a secondopening registering with said lateral projection when said blade isengaged by said bolt. v

2. A switch, comprising two supports, a lever blade pivoted to one ofsaid supports and cooperating with a circuit terminal on the othersupport, a bolt slidable in said lastnamed support in a directionperpendicular to the plane of movement of said blade and entering anopening in said blade, a spring for holding said bol-t in .engagementwith said blade, a lateral projection on said bolt, the said bladehaving a second opening registering with said lateral projection whensaid blade is engaged by said bolt, and a separate bar constructed toenter said second opening to meet said projection and retract said boltand having a `recess engaging with the edge of said opening when saidbolt is retracted.

In testimony whereof I have affixed my si gnature -in presence of twowitnesses.

JEROME MAIBAUM.

Vitnesses; v

Gna'rizcm: T. PORTER,

MAY T. MCGARRY.'

